求助 天山新题20(老题新问)

20. Puritan fanatics brought to civial and military affairs a coolness of judgement and mutability of purpose that some writers have though inconsistent with their religious zeal, but which was in fact a natural outgrowth of it.
    

A. but which was in fact a natural outgrowth of it

B. but which were in fact a natural outgrowth of it

C. but which were in fact natural outgrowth of it

D. but it was in fact a natural outgrowth of them

E. which was in fact a natural outgrowth of it

第一个问题以前也有人问过，即“though”是否印错了，该是thought， 还是我水平不够，怎么看不懂什么意思，看以前的帖子，这个词一变，对句子结构的解释就天差地别了

第二个问题， but和which能连着一起用吗？如果which在此是定语从句的连词，那but是什么词性，but作adv可只有“除了”的意思啊

谢了，哪位高手指点一下？